Systematic analysis of different experimental approaches to measure electronic stopping of very slow hydrogen ions

Roth, D.; Celedón, Carlos; Goebl, D.; Sánchez, Esteban; Bruckner, Barbara; Steinberger, R.; Guimpel, J.; Arista, N. R.; Bauer, Péter

doi:10.1016/j.nimb.2018.09.028

Cited by 13 publications

(13 citation statements)

References 41 publications

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“…4a, which is an indication of fewer geometric effects on the stopping power. The two direction results compare well with recent experimental results from Roth et al [48] and Tran et al [50] for projectile velocities less than 1.5 a.u. The maximum S e occurs at similar range in v for both directions with 111 direction having the lowest stopping power value.…”

Section: Channeling and Off-channeling Trajectoriessupporting

confidence: 89%

“…Fig. 4 Electronic stopping power versus velocity of H (top panel) and He (bottom panel) projectile in bulk Ni along the 111 and off-channel directions as obtained from TDDFT and compared with SRIM database [10] (black solid lines) and recent experimental results ( [48] (H), [50] (H and He) and [49] (He)). The off-channel represents the average of random directions of the projectile in the nickel lattice and its data points are taken from Ref.…”

Section: (A) (B)mentioning

confidence: 99%

“…Nonlinear response effects, which tend to be relatively stronger at low velocities, and explicit treatment of the target lattice are the main motivations to utilize ab initio simulations like the one presented here. These aforementioned historical results are now included indirectly in the SRIM database and model [10], which we include in the plots for comparison along with more recent experimental results by Roth et al [48] (for H + ), Mikheev et al [49] (for He) and Tran et al [50] (for both H + and He projectiles in Ni).…”

Section: Introductionmentioning

confidence: 99%

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Directional dependency of electronic stopping in nickel, projectile’s excited charge state and momentum transfer

2021

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We studied the directional dependency of electronic stopping power of swift light ions in nickel using real-time time-dependent density functional theory. We report a variation of electronic stopping for moving ions as the projectile probes different electronic densities of the host material. These results show that while the predicted magnitude stays in reasonable agreement with experiment, for $$v > 2$$ v > 2 . a.u. simulating only low index crystallographic directions is not enough to sample the experimental average values. The ab initio simulations give us access to microscopic quantities, such as non-adiabatic forces, momentum transfer and transient excited state charges of the projectile and host ions, which are not available through other methods. We report these quantities for the first time.

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Section: Channeling and Off-channeling Trajectoriessupporting

confidence: 89%

Section: (A) (B)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Directional dependency of electronic stopping in nickel, projectile’s excited charge state and momentum transfer

2021

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“…Atomic as well as molecular ion beams with a primary energy between 0.5 keV and 10 keV are used and projectiles backscattered into the stop detector located at an angle of ϑ =129° are detected. Three different sets of samples have been investigated: (i) in-situ grown Ni films with 9.1 nm, 8.3 nm and 6.5 nm thickness on a thick B film on Si [30], (ii) a high purity polycrystalline Ni sheet and (iii) thick amorphous Si. The thicknesses of the Ni films were determined via RBS by the use of an AN700 van de Graaf accelerator at the University of Linz.…”

Section: Methodsmentioning

confidence: 99%

Electronic interaction of slow hydrogen and helium ions with nickel-silicon systems

et al. 2019

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Paper accepted for publication by Physical Review A Link to the abstract: https://journals.aps.org/pra/accepted/af070N0aRc31281619294920dc695c1c385658bbf Electronic stopping cross sections (SCS) of nickel, silicon and nickel-silicon alloys for protons and helium (He) ions are studied in the regime of medium and low energy ion scattering, i.e., for ion energies in the range from 500 eV to 200 keV. For protons, at velocities below the Bohr velocity the deduced SCS is proportional to the ion velocity for all investigated materials. In contrast, for He ions non-linear velocity scaling is observed in all investigated materials. Static calculations using density functional theory (DFT) available from literature accurately predict the SCS of Ni and Ni-Si alloy in the regime with observed velocity proportionality. At higher energies, the energy dependence of the deduced SCS of Ni for protons and He ions agrees with the prediction by recent timedependent DFT calculations. The measured SCS of the Ni-Si alloy was compared to the SCS obtained from Bragg's rule based on SCS for Ni and Si deduced in this study, yielding good agreement for protons, but systematic deviations for He projectiles, by almost 20%. Overall, the obtained data indicate the importance of non-adiabatic processes such as charge-exchange for proper modelling of electronic stopping of in particular medium-energy ions heavier than protons in solids.

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“…Our pure Ni results agrees well with recent experimental results from Refs. [71,72] (for protons) and Ref. [73] (for helium).…”

Section: Resultsmentioning

confidence: 99%

Effect of Chemical Disorder on the Electronic Stopping of Solid Solution Alloys

et al. 2020

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The electronic stopping power of nickel-based equiatomic solid solutions alloys NiCr, NiFe and NiCo for protons and alpha projectiles is investigated in detail using real-time time-dependent density functional theory over a wide range of velocities. Recently developed numerical electronic structure methods are used to probe fundamental aspects of electron-ion coupling non-perturbatively and in a fully atomistic context, capturing the effect of the atomic scale disorder. The effects of particular electronic band structures and density of states reflect in the low velocity limit behavior. We compare our results for the alloys with those of a pure nickel target to understand how alloying affects the electronic stopping. We discover that NiCo and NiFe have similar stopping behavior as Ni while NiCr has an asymptotic stopping power that is more than a factor of two larger than its counterparts for velocities below 0.1 a.u.. We show that the low-velocity limit of electronic stopping power can be manipulated by controlling the broadening of the d-band through the chemical disorder. In this regime, the Bragg's additive rule for the stopping of composite materials also fails for NiCr. arXiv:1912.03399v1 [cond-mat.mtrl-sci]

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Systematic analysis of different experimental approaches to measure electronic stopping of very slow hydrogen ions

Cited by 13 publications

References 41 publications

Directional dependency of electronic stopping in nickel, projectile’s excited charge state and momentum transfer

Directional dependency of electronic stopping in nickel, projectile’s excited charge state and momentum transfer

Electronic interaction of slow hydrogen and helium ions with nickel-silicon systems

Effect of Chemical Disorder on the Electronic Stopping of Solid Solution Alloys

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